База данных: Статьи
Страница 6, Результатов: 57
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51.
Подробнее
38.3
S70
Sokolova, Ya. А.
The study of the properties and structure of cement binding composition on electrolyte acqueous solutions activated by mechanomagnetic method. [Текст] / Ya. А. Sokolova, M. V. Akulova, B. R. Isakulov, А. G. Sokolova [et al.] // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 86-91
ББК 38.3
Рубрики: Строительные материалы
Кл.слова (ненормированные):
Cement compositions, -- mechanomagnetic activation -- electrolyte aqueous solutions -- differential thermo gravimetric analysis -- compressive strength -- structure formation of binders -- sodium thiosulphate -- calcium chloride
Аннотация: In the present paper, the issues of studying the influence of complex activation of grouting fluid on the structure and properties of the hardened cement paste and concrete are considered. The problem is relevant for manufacturing of building materials. In the paper, there was used the method of applying in the concrete mix composition of the elementary chemical substances undergone special physical treatment by means of mechanomagnetic activation. For more profound study of the structure formation processes in the hardened cement paste, the method of differential thermo gravimetric analysis has been used. As the research results have shown, the concrete samples on the activated electrolyte solutions are characterized by improved strength. In addition, on the base of differential thermo gravimetric analysis, it was proven that in the studied samples of the hardened cement paste on the electrolyte solutions activated by the method of mechanomagnetic treatment, the less calcium hydroxide and the more hydrated calcium silicate with amorphous and fine crystalline is formed. The obtained results for cement composites could be applied when manufacturing effective binder for concretes and mortars in the production of building materials and structures.
Держатели документа:
WKU
Доп.точки доступа:
Akulova, M.V.
Isakulov, B.R.
Sokolova, А.G.
Kul’sharov, B.B.
Isakulov, А.B.
S70
Sokolova, Ya. А.
The study of the properties and structure of cement binding composition on electrolyte acqueous solutions activated by mechanomagnetic method. [Текст] / Ya. А. Sokolova, M. V. Akulova, B. R. Isakulov, А. G. Sokolova [et al.] // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 86-91
Рубрики: Строительные материалы
Кл.слова (ненормированные):
Cement compositions, -- mechanomagnetic activation -- electrolyte aqueous solutions -- differential thermo gravimetric analysis -- compressive strength -- structure formation of binders -- sodium thiosulphate -- calcium chloride
Аннотация: In the present paper, the issues of studying the influence of complex activation of grouting fluid on the structure and properties of the hardened cement paste and concrete are considered. The problem is relevant for manufacturing of building materials. In the paper, there was used the method of applying in the concrete mix composition of the elementary chemical substances undergone special physical treatment by means of mechanomagnetic activation. For more profound study of the structure formation processes in the hardened cement paste, the method of differential thermo gravimetric analysis has been used. As the research results have shown, the concrete samples on the activated electrolyte solutions are characterized by improved strength. In addition, on the base of differential thermo gravimetric analysis, it was proven that in the studied samples of the hardened cement paste on the electrolyte solutions activated by the method of mechanomagnetic treatment, the less calcium hydroxide and the more hydrated calcium silicate with amorphous and fine crystalline is formed. The obtained results for cement composites could be applied when manufacturing effective binder for concretes and mortars in the production of building materials and structures.
Держатели документа:
WKU
Доп.точки доступа:
Akulova, M.V.
Isakulov, B.R.
Sokolova, А.G.
Kul’sharov, B.B.
Isakulov, А.B.
52.
Подробнее
33
R24
Rasulov, S. R.
Hydrodynamic features of suspensions and emulsions flows. [Текст] / S. R. Rasulov, G. R. Mustafayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 99-104
ББК 33
Рубрики: Горное дело
Кл.слова (ненормированные):
hydrodynamics -- differential equation -- suspensions -- emulsions -- dispersed phase -- solid spherical particle -- turbulent flow -- pulsating motion
Аннотация: This scientific article is devoted to the problems associated with the flow of suspensions and emulsions and some simplifications of the real picture of the flow of a polydisperse medium are made. It is also stipulated that differential equations characterizing the motion of suspensions and emulsions should take into account the fundamental discontinuity of the medium and the physicochemical processes of heat and mass transfer occurring in it. Taking into account all these factors, a general equation for multiphase systems is proposed with certain simplifications that do not change.
Держатели документа:
WKU
Доп.точки доступа:
Mustafayeva, G.R.
R24
Rasulov, S. R.
Hydrodynamic features of suspensions and emulsions flows. [Текст] / S. R. Rasulov, G. R. Mustafayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №2. - P. 99-104
Рубрики: Горное дело
Кл.слова (ненормированные):
hydrodynamics -- differential equation -- suspensions -- emulsions -- dispersed phase -- solid spherical particle -- turbulent flow -- pulsating motion
Аннотация: This scientific article is devoted to the problems associated with the flow of suspensions and emulsions and some simplifications of the real picture of the flow of a polydisperse medium are made. It is also stipulated that differential equations characterizing the motion of suspensions and emulsions should take into account the fundamental discontinuity of the medium and the physicochemical processes of heat and mass transfer occurring in it. Taking into account all these factors, a general equation for multiphase systems is proposed with certain simplifications that do not change.
Держатели документа:
WKU
Доп.точки доступа:
Mustafayeva, G.R.
53.
Подробнее
35
J21
Jalmakhanbetova, R.I.
Calculate the standard enthalpies of combustion , formation and melting of the complex roseofungin with a-, B- and y- cyclodextrin. [Текст] / R.I. Jalmakhanbetova, Ye. M. Suleimen, B. K. Kasenov // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 44-47
ББК 35
Рубрики: chemical Technology
Кл.слова (ненормированные):
roseofungin -- cyclodextrin -- standard enthalpy of combustion -- standard enthalpy of formation -- enthalpy of melting of a complex
Аннотация: One of the most important quantities in chemical thermodynamics and thermochemistry is the enthalpy of combustion. Of the currently existing methods for calculating the heat of combustion of natural and synthetic organic compounds, the most acceptable and correct in our case was the Karash method. In this study, the standard enthalpy of combustion, the standard enthalpy of formation, and the melting enthalpy of the antibiotic roseofungin and its cyclodextrin derivatives were calculated. As a result of the study, the thermodynamic constants of the standard enthalpies of combustion, standard enthalpies of formation, and the enthalpies of melting of the above compounds were calculated, which are of interest for physicochemical modeling of processes with their participation, serve as initial information arrays for loading into fundamental thermodynamic data banks and reference books, and is also important for standardization and certification of these complexes. It should be noted that the presence of a large number of hydroxyl groups in the structures of the studied complexes allows them to be attributed to polar compounds.
Держатели документа:
WKU
Доп.точки доступа:
Suleimen, Ye.M.
Kasenov, B.K.
J21
Jalmakhanbetova, R.I.
Calculate the standard enthalpies of combustion , formation and melting of the complex roseofungin with a-, B- and y- cyclodextrin. [Текст] / R.I. Jalmakhanbetova, Ye. M. Suleimen, B. K. Kasenov // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 44-47
Рубрики: chemical Technology
Кл.слова (ненормированные):
roseofungin -- cyclodextrin -- standard enthalpy of combustion -- standard enthalpy of formation -- enthalpy of melting of a complex
Аннотация: One of the most important quantities in chemical thermodynamics and thermochemistry is the enthalpy of combustion. Of the currently existing methods for calculating the heat of combustion of natural and synthetic organic compounds, the most acceptable and correct in our case was the Karash method. In this study, the standard enthalpy of combustion, the standard enthalpy of formation, and the melting enthalpy of the antibiotic roseofungin and its cyclodextrin derivatives were calculated. As a result of the study, the thermodynamic constants of the standard enthalpies of combustion, standard enthalpies of formation, and the enthalpies of melting of the above compounds were calculated, which are of interest for physicochemical modeling of processes with their participation, serve as initial information arrays for loading into fundamental thermodynamic data banks and reference books, and is also important for standardization and certification of these complexes. It should be noted that the presence of a large number of hydroxyl groups in the structures of the studied complexes allows them to be attributed to polar compounds.
Держатели документа:
WKU
Доп.точки доступа:
Suleimen, Ye.M.
Kasenov, B.K.
54.
Подробнее
24
K17
Кairbekov, Zh. К.
Physicochemical and antioxidant properties of humic acids of low-mineralized peloids of the Tuzkol deposit. [Текст] / Zh. К. Кairbekov, I. M. Jeldybayeva, D. Z. Аbilmazhinova, S. M. Suimbayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 48-53
ББК 24
Рубрики: chemistry
Кл.слова (ненормированные):
Low-mineralized sludge sulphide mud (peloids) -- humic -- fulvic -- hymatomelanic -- humic acids -- antioxidant activity
Аннотация: As a result of studies it was found that the peloids of the deposit of Tuzkol Lake (Republic of Kazakhstan) are high quality medium-sulfide, weakly alkaline sludge muds. It was found that peloid-derived humic acid contains 49.63 % oxygen, 22.37% carbon, 9.65 % silicon and 6.26% calcium; it also contains Na, Mg, Al, Fe and an insignificant amount of S, Cl, K, F. Electron microscopy and IR spectroscopy analysis of the molecular structure of humic substances of peloids indicated that their macromolecule consists of framework olefinic and aromatic fragments with a substantial proportion of unoxidized aliphatic groups, as well as aromatic structures containing carboxyl groups. The findings of amperometric detection of the antioxidant properties of humic acids suggest that they have antioxidant activity, which will make it possible to use them as a biologically active substance for medicines.
Держатели документа:
WKU
Доп.точки доступа:
Jeldybayeva, I.M.
Аbilmazhinova, D.Z.
Suimbayeva, S.M.
K17
Кairbekov, Zh. К.
Physicochemical and antioxidant properties of humic acids of low-mineralized peloids of the Tuzkol deposit. [Текст] / Zh. К. Кairbekov, I. M. Jeldybayeva, D. Z. Аbilmazhinova, S. M. Suimbayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 48-53
Рубрики: chemistry
Кл.слова (ненормированные):
Low-mineralized sludge sulphide mud (peloids) -- humic -- fulvic -- hymatomelanic -- humic acids -- antioxidant activity
Аннотация: As a result of studies it was found that the peloids of the deposit of Tuzkol Lake (Republic of Kazakhstan) are high quality medium-sulfide, weakly alkaline sludge muds. It was found that peloid-derived humic acid contains 49.63 % oxygen, 22.37% carbon, 9.65 % silicon and 6.26% calcium; it also contains Na, Mg, Al, Fe and an insignificant amount of S, Cl, K, F. Electron microscopy and IR spectroscopy analysis of the molecular structure of humic substances of peloids indicated that their macromolecule consists of framework olefinic and aromatic fragments with a substantial proportion of unoxidized aliphatic groups, as well as aromatic structures containing carboxyl groups. The findings of amperometric detection of the antioxidant properties of humic acids suggest that they have antioxidant activity, which will make it possible to use them as a biologically active substance for medicines.
Держатели документа:
WKU
Доп.точки доступа:
Jeldybayeva, I.M.
Аbilmazhinova, D.Z.
Suimbayeva, S.M.
55.
Подробнее
24
M23
Mamyrbekova, А.
Study of kinetics of copper oxidation by electrolysis under non-stationary conditions. [Текст] / А. Mamyrbekova, А. Mamyrbekova, M. К. Kassymova, A. Zh. Aitbayeva, O. N. Chechina // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 54-59
ББК 24
Рубрики: chemistry
Кл.слова (ненормированные):
copper electro-oxidation -- copper (I) oxide -- copper (II) oxide -- unsteady electrolysis -- electrolyte -- polarisation curves
Аннотация: The nature of the anion electrolyte affects the rate of copper anodic oxidation, while the process occurs more efficiently in solutions of sulfate and sodium chloride and is accompanied by significant polarisation. Based on the study of kinetics the possibility of obtaining powders of metal oxide was shown, which further allowed to determine the parameters of the electrolysis process in non-stationary conditions in order to obtain highly dispersed materials based on copper oxides with specific physico-chemical properties.
Держатели документа:
WKU
Доп.точки доступа:
Mamyrbekova, А.
Kassymova, M.К.
Aitbayeva, A.Zh.
Chechina, O.N.
M23
Mamyrbekova, А.
Study of kinetics of copper oxidation by electrolysis under non-stationary conditions. [Текст] / А. Mamyrbekova, А. Mamyrbekova, M. К. Kassymova, A. Zh. Aitbayeva, O. N. Chechina // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 54-59
Рубрики: chemistry
Кл.слова (ненормированные):
copper electro-oxidation -- copper (I) oxide -- copper (II) oxide -- unsteady electrolysis -- electrolyte -- polarisation curves
Аннотация: The nature of the anion electrolyte affects the rate of copper anodic oxidation, while the process occurs more efficiently in solutions of sulfate and sodium chloride and is accompanied by significant polarisation. Based on the study of kinetics the possibility of obtaining powders of metal oxide was shown, which further allowed to determine the parameters of the electrolysis process in non-stationary conditions in order to obtain highly dispersed materials based on copper oxides with specific physico-chemical properties.
Держатели документа:
WKU
Доп.точки доступа:
Mamyrbekova, А.
Kassymova, M.К.
Aitbayeva, A.Zh.
Chechina, O.N.
56.
Подробнее
24
Р 86
Румянцев, Р. Н.
Исследование свойств CuO-ZnO-Al2O3 катализаторов для синтеза метанола. [Текст] / Р. Н. Румянцев, А. А. Батанов, И. Н. Цымбалист, А. А. Ильин [и др.] // Известия высших учебных заведений . - 2021. - Т.64. Вып.10. - С. 56-64
ББК 24
Рубрики: Химия
Кл.слова (ненормированные):
CuO-ZnO-Al2O3 catalyst -- methanol synthesis -- physicochemical properties -- синтез метанола -- дезактивация
Аннотация: В работе проведено комплексное исследование современных промышленных каталитических систем марки ММ-7 и К. Лучший образец – катализатор марки ММ-7 исследован до и после 5 лет промышленной эксплуатации в крупнотоннажном агрегате синтеза метанола. Для изучения физико-химических характеристик катализаторов были использованы методы рентгенофазового анализа, сканирующей электронной микроскопии, низкотемпературной адсорбции-десорбции азота, индикаторный метод Гаммета, газовой хроматографии. Проведено температурно-программируемое восстановление образцов. В работе приведены данные по фазовому составу катализаторов, их морфологии, удельной поверхности, дисперсности и размеру частиц меди. Установлено, что катализатор марки ММ-7 по своим физико-химическим характеристикам и каталитической активности превосходит катализатор марки К. Исследование отработанного катализатора после 5 лет промышленной эксплуатации показало, что потеря активности происходит по причине термической дезактивации и отравления каталитическими ядами – соединениями серы. Каталитическая активность образца оценивалась по удельной производительности по метанолу на каталитической установке высокого давления ПКУ-2. Условия эксперимента были максимально приближены к промышленным: давление в реакторе составляло 2,0 МПа, интервал исследуемых температур 200-300 °С, объемная скорость газа 8705 ч-1. Максимальная удельная производительность по метанолу достигается при 260 °С и составляет 0,07 мкмоль/гкат·с. Также приведены данные образцов по селективности по метанолу. Максимальная селективность по метанолу достигается на катализаторе марки ММ-7 и составляет 98,7 % при 220 °С. В качестве побочных продуктов, образующихся в процессе синтеза метанола, идентифицированы метан и диметиловый эфир.
Держатели документа:
ЗКУ
Доп.точки доступа:
Батанов, А.А.
Цымбалист, И.Н.
Ильин, А.А.
Гордина, Н.Е.
Гришин, И.С.
Р 86
Румянцев, Р. Н.
Исследование свойств CuO-ZnO-Al2O3 катализаторов для синтеза метанола. [Текст] / Р. Н. Румянцев, А. А. Батанов, И. Н. Цымбалист, А. А. Ильин [и др.] // Известия высших учебных заведений . - 2021. - Т.64. Вып.10. - С. 56-64
Рубрики: Химия
Кл.слова (ненормированные):
CuO-ZnO-Al2O3 catalyst -- methanol synthesis -- physicochemical properties -- синтез метанола -- дезактивация
Аннотация: В работе проведено комплексное исследование современных промышленных каталитических систем марки ММ-7 и К. Лучший образец – катализатор марки ММ-7 исследован до и после 5 лет промышленной эксплуатации в крупнотоннажном агрегате синтеза метанола. Для изучения физико-химических характеристик катализаторов были использованы методы рентгенофазового анализа, сканирующей электронной микроскопии, низкотемпературной адсорбции-десорбции азота, индикаторный метод Гаммета, газовой хроматографии. Проведено температурно-программируемое восстановление образцов. В работе приведены данные по фазовому составу катализаторов, их морфологии, удельной поверхности, дисперсности и размеру частиц меди. Установлено, что катализатор марки ММ-7 по своим физико-химическим характеристикам и каталитической активности превосходит катализатор марки К. Исследование отработанного катализатора после 5 лет промышленной эксплуатации показало, что потеря активности происходит по причине термической дезактивации и отравления каталитическими ядами – соединениями серы. Каталитическая активность образца оценивалась по удельной производительности по метанолу на каталитической установке высокого давления ПКУ-2. Условия эксперимента были максимально приближены к промышленным: давление в реакторе составляло 2,0 МПа, интервал исследуемых температур 200-300 °С, объемная скорость газа 8705 ч-1. Максимальная удельная производительность по метанолу достигается при 260 °С и составляет 0,07 мкмоль/гкат·с. Также приведены данные образцов по селективности по метанолу. Максимальная селективность по метанолу достигается на катализаторе марки ММ-7 и составляет 98,7 % при 220 °С. В качестве побочных продуктов, образующихся в процессе синтеза метанола, идентифицированы метан и диметиловый эфир.
Держатели документа:
ЗКУ
Доп.точки доступа:
Батанов, А.А.
Цымбалист, И.Н.
Ильин, А.А.
Гордина, Н.Е.
Гришин, И.С.
57.
Подробнее
22
S 53
Shaikhova, G. N.
Traveling wave solutions for the extended modified korteweg-de vries equation [Текст] / G. N. Shaikhova, B. K. Rakhimzhanov // Вестник национальной инженерной академии Республики Казахстан. - 2021. - №4. - с. 197-203
ББК 22
Рубрики: Физико-математические науки
Кл.слова (ненормированные):
extended modified Korteweg-de Vries equation -- sine-cosine method -- ordinary differential equation -- partial differential equation -- nonlinearity
Аннотация: In this paper, we study an extended modified Korteweg-de Vries equation, which contains the relevant higher-order nonlinear terms and fifth-order dispersion. This equation is the extension of the modified Korteweg-de Vries equation and described by the Ablowitz-Kaup-Newell-Segur hierarchy. The standard Korteweg-de Vries equation is the pioneer integrable model in solitary waves theory which gives rise to multiple solition solutions. The Korteweg-de Vries equation arises naturally from shallow water, plasma physics, and other fields of science.
Держатели документа:
ЗКУ им М. Утемисова
Доп.точки доступа:
Rakhimzhanov, B. K.
S 53
Shaikhova, G. N.
Traveling wave solutions for the extended modified korteweg-de vries equation [Текст] / G. N. Shaikhova, B. K. Rakhimzhanov // Вестник национальной инженерной академии Республики Казахстан. - 2021. - №4. - с. 197-203
Рубрики: Физико-математические науки
Кл.слова (ненормированные):
extended modified Korteweg-de Vries equation -- sine-cosine method -- ordinary differential equation -- partial differential equation -- nonlinearity
Аннотация: In this paper, we study an extended modified Korteweg-de Vries equation, which contains the relevant higher-order nonlinear terms and fifth-order dispersion. This equation is the extension of the modified Korteweg-de Vries equation and described by the Ablowitz-Kaup-Newell-Segur hierarchy. The standard Korteweg-de Vries equation is the pioneer integrable model in solitary waves theory which gives rise to multiple solition solutions. The Korteweg-de Vries equation arises naturally from shallow water, plasma physics, and other fields of science.
Держатели документа:
ЗКУ им М. Утемисова
Доп.точки доступа:
Rakhimzhanov, B. K.
Страница 6, Результатов: 57